I was just in the process of writing David Fernandez Gonzalez an Email
about this problem when I came across this ticket.

I can confirm this problem on Ubuntu 18.04.6.  My 20.x machines did not
get the update, so I cannot verify on other releases:

Unpacking cron (3.0pl1-128.1ubuntu1.1) over (3.0pl1-128.1ubuntu1) ...
Setting up cron (3.0pl1-128.1ubuntu1.1) ...
stat: cannot stat '*': No such file or directory
stat: cannot stat '*': No such file or directory
stat: cannot stat '*': No such file or directory
Warning: * is not a regular file!

Every single sysadmin should be concerned.  ANY TIME we see asterisk
wildcards being used in this fashion, where [ or test operators are
behaving in this manner, we have reason to become concerned.  To me,
this smells of a shell script trying to parse crontab entries, which is
inherently dangerous.

I am now questioning whether or not this postinst script potentially
nuked something it shouldn't have.

How this was missed is beyond me.

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https://bugs.launchpad.net/bugs/1971895

Title:
  Warning messages from stat printed on installation with no user
  crontabs

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